package com.hdl.interceptor;

import com.hdl.constants.Constants;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 类名 LoginInterceptor
 * 描述 登陆拦截器，如果没有登陆访问其他资源，强制跳转到登录页
 *
 * @author hedonglin
 * @version 1.0
 * @date 2020/5/16 13:24
 */
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle.......");
        Object username = request.getSession().getAttribute(Constants.USER_SESSION_KEY);
        if (username == null){
            response.sendRedirect("/login");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle........");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion........");
    }
}
